Flange Collar is a kind of fittings working together with lap joint flange(Loose flange)according to EN standard and DIN standard(flange standard).In other standard,people also call it stub end.It is kind of same meanings.
Even in the standards,there are different types collars.Some flange collars are just like steel rings which are called weld on collars and some collars have a weld neck which are used to butt welding(what is butt welding) with the connected pipes.Those collars could be produced from forged materials or pressed from steel plates.
There are specified dimensions and technical data for the collars in standards, but the user also can design the collars as per working conditions.The most important point for collar is matched the lap joint flange. Hebei haihao flange factory can supply the customized flange collars according to your requirements.
Hebei Haihao Flange Factory finished the customized flange collars(stub ends) order as per clients requirement before new Chinese New Year holidays.
Our customer from Europe placed this new collars order for the lap joint flanges they purchased from us.The collars are designed by their engineers who is also designing the piping system.
The collars are not like the common collars which are butt welded or slip on welded to the steel pipes.The collars will be socket welded with the steel pipe bends then joint by a lap joint flange. According to the design, the connection would be better than the regular ring collars.(Haihao Factory is producing 180 degree bends for Petro pipeline)
Welcome to contact us if you have regular or non-standard flanges requests,Haihao Flange Factory will help you to solve any problems you meet in flange connection.